The focal length of field achromatic combination of a telescope is 90 – InterviewSolution

1.	The focal length of field achromatic combination of a telescope is 90 cm. The dispersive powers of lenses are 0.012 and 0.018 respectively. Their focal lengths will be
Answer» The focal length of field achromatic combination of a telescope is 90 cm. The dispersive powers of lenses are 0.012 and 0.018 respectively. Their focal lengths will be

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